// Copyright (c) 2010-2012, Tetsuo Kiso
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//  * Redistributions of source code must retain the above
//    copyright notice, this list of conditions and the
//    following disclaimer.
//
//  * Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the
//    following disclaimer in the documentation and/or other
//    materials provided with the distribution.
//
//  * Neither the name of Tetsuo Kiso nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef AROWPP_RANDOM_H_
#define AROWPP_RANDOM_H_

#include <ctime>

namespace arowpp {
namespace {

class Random {
public:
  Random() {
    InitSeed();
  }

  void InitSeed() {
    srand(static_cast<unsigned int>(time(NULL)));
  }

  unsigned int operator() (unsigned int max) {
    double tmp = static_cast<double>(rand()) / static_cast<double>(RAND_MAX);
    return static_cast<unsigned int>(tmp * max);
  }
};
} // namespace

// Shuffle data at random
template <class T>
void ShuffleRandom(std::vector<T>& examples) {
  Random r;
  std::random_shuffle(examples.begin(), examples.end(), r);
}

} // namespace arowpp
#endif  // AROWPP_RANDOM_H_
